You must include the repraconn.jar file in your CLASSPATH environment variable setting.
For Unix enter:
For bsh:
CLASSPATH =$REPRA_HOME/lib/repraconn.jar:$CLASSPATH export CLASSPATH
For csh:
setenv CLASSPATH $REPRA_HOME/lib/repraconn.jar:$CLASSPATH
For Windows, enter:
SET CLASSPATH=%REPRA_HOME%\lib\repraconn.jar;/%CLASSPATH%